List of top Chemistry Questions asked in JEE Main

Which of the following statements is false?

A sample of $NaClO_3$ is converted by heat to NaCl with a loss of $0.16\, g$ of oxygen. The residue is dissolved in water and precipitated as $AgCl$. The mass of $AgCl$ (in g) obtained will be : (Given : Molar mass of $AgCl = 143.5\, g\, mol^{-1}$)

Xenon hexafluoride on partial hydrolysis produces compounds ?X? and ?Y?. Compounds ?X? and ?Y? and the oxidation state of Xe are respectively :

The decreasing order of bond angles in $BF_{3} , NH_{3} , PF_{3}$ and $I_{3}{^{-}}$ is

For which of the following reactions, $\Delta H$ is equal to $\Delta U$ ?

Lithium aluminium hydride reacts with silicon tetrachloride to form :

The major product obtained in the following reaction is
 

The most polar compound among the following is :

The oxidation states of $Cr$ in $ [Cr(H_2O)_6]Cl_3, [Cr(C_6H_6)_2]$, and $K_2[Cr(CN)_2(O)_2(O_2)(NH_3)]$ respectively are :

For $Na^{+}, Mg^{2+}, F^{-}$ and $O^{2-}$; the correct order of increasing ionic radii is :

For a first order reaction, $A \to P, t_{1/2}$ (half life) is 10 days. The time required for $\frac{1^{th}}{4}$ conversion of A (in days) is : (ln 2=0.693, ln 3=1.1)

When an electric current is passed through acidified water, $112\, mL$ of hydrogen gas at N.T.P. was collected at the cathode in $965$ seconds. The current passed, in ampere, is :

Which of the following compounds will be suitable for Kjeldahl's method for nitrogen estimation?

In the extraction of copper from its sulphide ore, metal is finally obtained by the oxidation of cuprous sulphide with :

The INCORRECT statement is :

Which of the following conversions involves change in both shape and hybridisation?

Which of the following statements is false?

In the molecular orbital diagram for the molecular ion, $N_2{^{+}}$, the number of electrons in the $\sigma_{2p}$ molecular orbital is :

Which of following lines correctly show the temperature dependence of equilibrium constant $K$, for an exothermic reaction ?

Which one of the following is not a property of physical adsorption?

The correct order of spin-only magnetic moments among the following is : (Atomic number : Mn=25, Co=27, Ni=28, Zn=30)

According to molecular orbital theory, which of the following will not be a viable molecule ?

In \(XeO_3F_2\), the number of bond pair(s), \(\pi\)-bond(s) and lone pair(s) on \(Xe\) atom respectively are :

For which of the following processes, $\Delta S$ is negative ?